Why is this such a sought-after feature? Although the convenience of wireless is obvious, from what I hear the technology generally does not provide nearly the sound quality of wired headsets. Some have even called most BT headsets "unusable" for this reason.
In any case, I suspect that the primary reason this is not enabled has to do with the tenuous relationship Apple has with the record companies, who are scared to the point of being paranoid about copyright. Any kind of wireless transmission, even privately via BT, scares the crap out of them. I suspect this was a concession Apple felt it could make to them. Also the reason Apple does not include FM transmission in iPods and iPhones.
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